package com.itheima.itheima_health.Spring_Security.service;

import com.itheima.itheima_health.pojo.Permission;
import com.itheima.itheima_health.pojo.Role;
import com.itheima.itheima_health.pojo.User;
import com.itheima.itheima_health.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

@Component
public class SpringSecurityUserService implements UserDetailsService {
    //根据用户名查询数据库获取用户信息
    @Autowired
    private UserService userService;
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userService.findByUsername(username);
        if (user == null){
            //用户不存在
            return null;
        }

        List<GrantedAuthority> list = new ArrayList<>();

        //动态为当前用户授权
        Set<Role> roles = user.getRoles();
        for (Role role : roles) {
            //遍历角色,为用户授权角色
            list.add(new SimpleGrantedAuthority(role.getKeyword()));
            Set<Permission> permissions = role.getPermissions();
            for (Permission permission : permissions) {
                //遍历权限集合,为用户授权
                list.add(new SimpleGrantedAuthority(permission.getKeyword()));
            }
        }

        org.springframework.security.core.userdetails.User securityUser = new org.springframework.security.core.userdetails.User(username,user.getPassword(),list);

        return securityUser;
    }
}
